feat: RevMiddleware: Clone + PubSubClient

[Autoparallel]

@Alexangelj is this what you want to try working with?

[codecov]

Codecov Report

Attention: 19 lines in your changes are missing coverage. Please review.

Comparison is base (6015ac2) 52.63% compared to head (c851c5e) 52.51%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
arbiter-core/src/middleware/mod.rs	0.00%	18 Missing ⚠️
arbiter-core/src/middleware/connection.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #743      +/-   ##
==========================================
- Coverage   52.63%   52.51%   -0.12%     
==========================================
  Files          36       36              
  Lines        7277     7293      +16     
==========================================
  Hits         3830     3830              
- Misses       3447     3463      +16     

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[Alexangelj]

ty

[0xJepsen]

lgtm